body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}
h1 {
    text-align: center;
}
/*输入框样式*/
input[type="text"], input[type="password"] {
    margin-bottom: 10px;
    width: auto;
}

/*基本按钮样式*/
button {
    background-color: #4CAF50;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

/*输入部分box*/
.input-external-box {
    position: relative;
    margin: auto;
    width: 30%;
}

/*提交按钮*/
.submit-button {
    display: block;
    margin: auto;
}

/*描述文字*/
.describe-text {
    display: inline-block;
    width: 80px;
    white-space: nowrap;
}

/*提醒文字*/
.warning {
    display: block;
    text-align: center;
    color: red;
}